Glen, I wonder where that wheel gets any range of cush when ALL space in the holes is filled with rubber or so at 100 % . This leads to solid locked unit, unless you provide some space that can squash, like a hole in the rubber. Not talking about usefulness of a cushdrive in the rear wheel when on a chain machine, there should be some bearing somewhere for taking up chain pull plus rotational loads with a cush drive, so some bush or bearing has to be included.
Some time ago when I did some adjustments on the 460 cc Horex with China friction plates in the clutch I changed old hardened rubbers in the clutch "cush" for a set of 3 o-rings each on alu cylinders I turned up . So am a bit worried reading Greg`s reports about the Alton cush "ESA" on the electric start set. Well, time will tell - and I don´t do much of bike trips any more at plus 70 . . . .
Vic